littlefs v3 benchmarks

• codemaps - Codemaps for exploring code cost
• codemaps_rdonly - Codemaps for exploring rdonly code cost
• bench_internal - Internal data-structure benchmarks

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• bench_many - File/dir creation benchmarks
• bench_fwrite - File writing benchmarks
• bench_fwrite_tune - File writing benchmarks with tuneable configs

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• bench_vs_lfs2 - Benchmarks comparing littlefs v3 vs v2
• bench_vs_lfs2_ops - Benchmarks v3 vs v2 with low-level details

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• bench_vs_lfs2_1M - Benchmarks comparing littlefs v3 vs v2 - 1MiB files
• bench_vs_lfs2_1M_ops - Benchmarks v3 vs v2 with low-level details - 1MiB files